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Questar bell jar?

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13 replies to this topic

#1 dougspeterson

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Posted 27 August 2019 - 06:49 PM

Anyone found an affordable bell jar big enough to easily contain a Questar?


Edited by dougspeterson, 27 August 2019 - 06:49 PM.


#2 petert913

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Posted 27 August 2019 - 08:18 PM

I see quite a few glass bell jars on the internet.  But you may have to tip your Questar tube upward a bit more to fit it in.



#3 TOMDEY

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Posted 27 August 2019 - 10:08 PM

Display Cases --- Yes!

 

One would assert that a Questar deserves to go on display and that... it you can afford the scope...

 

Anyway, I'm big into displaying my optics stuff... especially my own concoctions.

 

Real Glass Bell Jars, with plano ground bottom edge are sure the most elegant and impressive. You can get them from commercial restaurant suppliers. And, of course, scientific laboratory glass suppliers. Quarter-inch thick walls. They aren't even very expensive. Here's a picture of one that I use. >>> The reason they call them bell jars is because they ring like a bell if you hold it up by that handle and ping it!

 

Blown Acrylic Domes come in all sizes, the bigger ones made to order... and also not very expensive. Here's a picture of one I had made for my meteorite. >>>

 

All-Glass Fish Tanks  come in a bunch of standard sizes and you can also order custom. Those are generally rectangular or hexagonal and can either get them without edge framing... so they are entirely clear.

 

All-Glass Home-Made You can easily make your own similar just using window glass and clear RTV. Be sure to emery the sharp edges and RTV an appropriate handle on top. The advantages are that it's cheap, easy, local, and custom. Picture >>>

 

Anyway... those are some ideas!    Tom

 

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#4 TOMDEY

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Posted 27 August 2019 - 10:09 PM

Nother pic >>>    Tom

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#5 TOMDEY

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Posted 27 August 2019 - 10:10 PM

Last pic >>>    Tom

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#6 JamesMStephens

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Posted 28 August 2019 - 11:41 AM

Tom Dey, do you have a thread on your solar projector?



#7 TOMDEY

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Posted 28 August 2019 - 03:12 PM

Tom Dey, do you have a thread on your solar projector?

Hi, James! Yes, somewhere back a couple years ago... imbedded in the Aug 21st, 2017 Solar Eclipse Stuff. Problem is, I have never figured out how to ~search~ the CN file archives using KeyWord... just don't see that feature anywhere here; maybe I'm missing something. Maybe someone can help me on that, or just confirm that CN keyword search just does not exist.

 

Anyway, here are a couple pictures from my own files >>>

I "invented" the projector in a day and built it the next. Took it to Casper, Wyoming and happily used it! The gizmo comprises three Star Diagonals, an ophthalmic +0.125 precision Diopter Singlet, and a Televue Sol Searcher. The nice thing - it just sits in the sun and sends the image over to a convenient paper screen. The 3-inch image is invariant... stationary, right there on the screen, 27 feet away... on e.g. a shaded fence in the yard or even through a window into the house!

 

I assume others have done similar. The beauty of mine is that it's cheap, commercial parts, sharp image, group viewing (front or rear-projection screen), and flexible to locate and point... and easily motorized for tracking the sun, dawn to dusk... and everything inbetween.    Tom

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#8 TOMDEY

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Posted 28 August 2019 - 03:14 PM

Nother pic    Tom

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#9 JamesMStephens

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Posted 29 August 2019 - 01:23 PM

I know we're getting of topic, but that projector is neat!  You're just projecting the solar image with a long FL lens, and manually adjusting the axes to track the Sun (I think).

 

Jim


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#10 Optics Patent

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Posted 29 August 2019 - 01:56 PM

I had a display case made for my Cutaway project that everyone would otherwise want to touch.  I went with an elevated base, mirror floor and back wall to show more views, and was happy for under $250 shipped.

 

IMG 5579
 
The source is linked here.

Edited by Optics Patent, 29 August 2019 - 01:57 PM.

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#11 TerryWood

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Posted 29 August 2019 - 01:59 PM

That is super nice! Museum quality. V/R Terry

#12 TOMDEY

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Posted 29 August 2019 - 03:31 PM

I know we're getting of topic, but that projector is neat!  You're just projecting the solar image with a long FL lens, and manually adjusting the axes to track the Sun (I think).

 

Jim

Hi, Jim, Yep! At that point I had not added motors, but it's SO easy to find the sun (using the Sol Searcher...) and then just counter-rotate that last periscopic head... still very convenient. It takes just two drives that could be either automated or (maybe more reasonably) using JMI Train N Track... with the control paddle on an extension cord located at the rear-projection screen, with the beam coming in thru an open window, into the house! Hmmm... that would be very easy! Staring at mine, here... I can see where I could amend that to the thing no problem. I've got the mechanicals figured out... Az pivot at base with exiting periscope held invariant... track that axis to get stationary L-R at screen. And the Alt one drives the input periscope to maintain stationary U-D. That would certainly work! Hmmm...

 

Of course--- this thing is only good for the sun... even the moon would be terribly dim... at F/320! With a one-inch aperture, resolution at the image is about 5 arc-sec... which looks nice and sharp on the 3-inch image. I know people have done various all-optical solar scope projectors... but usually grandiose bigger using those giant mirrors up top, and all. The ultimate of that approach would be the KPNO McMath Solar Scope! I was there, long ago... When you go up top... the mirrors are loaded with pigeon signatures!    Tom

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#13 JamesMStephens

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Posted 29 August 2019 - 08:16 PM

 

I had a display case made for my Cutaway project that everyone would otherwise want to touch.  I went with an elevated base, mirror floor and back wall to show more views, and was happy for under $250 shipped.

 

 
 
The source is linked here.

 

You've even got the famous pen in the display!


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#14 Toddeo

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Posted 29 August 2019 - 08:35 PM

For a variety of acrylic display cases, just type in: :acrylic display cases", there are quite a few sites on the internet.

EXAMPLE:

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Edited by Toddeo, 29 August 2019 - 08:43 PM.



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